dude, where are you getting these brushes from?? if they are just airbrushed, that's incredible. I'm assuming that's Freeman? If it is, perhaps take the HL2 logo, and blend that in to the left/middle.
most of the brushes are made by me, just look at some brush tutorials, the rest just comes from trial.
The only things I can think of to make it look more cold would be frost on his mustache... or "steam" for breath. You do good work!
